Antlia 2.8 nm and LRGB filter - Forums

Topic starter

Jun 30, 2023 · Edited: Jun 30, 2023

Soon I will buy the 2600mm pro camera and for that I need filters (36mm). I have until now used Antlia 3 nm filter with my 1600mm pro.

Is it worth spending a little extra for the 2.8 nm filter?
How are the Antlia LRGB filter?

Nick Grundy

Jun 30, 2023

you'll probably get a bunch of different opinions on this, but I would say no. 3nm is already really narrow, I don't think you'd get much better signal than that.

I've actually stopped using my 3nm Optolongs in favor of 8nm Chroma for narrowband. I have to be a little more aware of the moon and other light pollution, but getting much improved signal

Michael Ring

Jun 30, 2023 · Edited: Jun 30, 2023

I recently upgraded to the 2.8nm filters and already owned the 3nm filters.
For the new "dark" LRGB filters I think the new version is actually an improvement when I compare the measurement curves of the new with the old filters but perhaps I was just not lucky when buying my old LRGB set (I bought the old filters on Aliexpress because they were not available anywhere else)

Because of the really bad weather until last month and some technical issues I do not have enough data to give feedback on improvement with Halos for Oiii and Sii, so far I only shot Ha in higher quantity.

I shot with identical Telescopes and (nearly) same camera and could not make out much of a difference. I am in Bortle 4, perhaps in higher Bortle the effects are stronger.

Michael

Tareq Abdulla

Jul 1, 2023

I am in Bortle 8/9, in the past when that old sodium type lights are all around i used Astrodon Ha 5nm and Chroma OIII/SII 3nm, they all did amazing job, i didn't find myself needing any narrower, but that was in the past, but since 2022 all street lights in front of my house changed/replaced into LED, so maybe i will think about something narrower, i will decide once i am back to imaging.

I do have Antlia Ha 3nm 2" and Optolong SII 3nm 2" i bought the second with an offer price, so only thinking about which OIII 2" to buy, but i was more thinking about dual narrowband filter to give me Ha and OIII together so i don't buy individual OIII filter, but i am not in rush for any filter, actually Antlia also produced 2.5nm SHO filters set, so i can't tell what 2.8nm or 2.5nm can do over 3nm, under Bortle 8/9 narrowbanding isn't very difficult, and most targets i will image are almost away from LED once they ascending in the sky by the time, so i will not force myself to go much narrower, it is all marketing things actually.